CN110563166A - Method and device for softening and removing calcium from desulfurization wastewater - Google Patents
Method and device for softening and removing calcium from desulfurization wastewater Download PDFInfo
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- CN110563166A CN110563166A CN201910900877.9A CN201910900877A CN110563166A CN 110563166 A CN110563166 A CN 110563166A CN 201910900877 A CN201910900877 A CN 201910900877A CN 110563166 A CN110563166 A CN 110563166A
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- calcium
- desulfurization wastewater
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Abstract
The invention provides a method and a device for softening and removing calcium from desulfurization wastewater, wherein a calcium removal promoter is added into the desulfurization wastewater treated by a triple box to obtain first produced water, wherein the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15; and adding sodium carbonate into the first produced water for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2. Therefore, only calcium hardness and not magnesium hardness can be removed in the process of softening and hardness removal of the desulfurization wastewater, the adding amount and the adding cost of chemical agents are reduced, and the removal efficiency of the calcium hardness under the condition of interference of various ions in the desulfurization wastewater is improved.
Description
Technical Field
The invention belongs to the field of desulfurization wastewater treatment, and particularly relates to a desulfurization wastewater softening and calcium removing method and device.
Background
At present, most of domestic desulfurization systems of thermal power plants adopt a limestone-gypsum wet desulfurization process, but when the desulfurization is carried out by using the method, a part of absorption tower slurry is discharged as desulfurization wastewater. The desulfurization waste water contains a large amount of suspended matters and Cl-，F-、SO4 2-、Ca2+、Mg2+and the like, and simultaneously contains trace heavy metal ions, so that the pollution is strong, and the waste water cannot be directly recycled. In order to respond to the call of national environmental protection policies and adapt to the new trend that environmental protection standards are becoming stricter, more and more power plants put forward the comprehensive treatment and zero discharge of the wastewater of the whole plant to a negotiation schedule, develop feasibility researches on zero discharge of the wastewater, and the key for realizing the zero discharge of the wastewater of the whole plant is to realize the zero discharge of the desulfurization wastewater. Because a gypsum wet desulphurization process is adopted, the content of calcium in the desulphurization wastewater is particularly high, zero discharge of the desulphurization wastewater is to be realized, softening and hardness removal of the desulphurization wastewater is an indispensable process, and at present, the hardness removal by adopting a double-alkali method is a common method on the desulphurization wastewater softening process, but because the chemical hardness removal is adopted by adopting the double-alkali method, a large amount of sodium carbonate, caustic soda flakes or lime needs to be added in the softening process, the cost of adding chemicals to remove hardness generally reaches 70-80 yuan/ton of wastewater, the treatment cost is higher, and a large amount of chemical sludge is generated at the same time.
In the prior art, the conventional treatment method of the desulfurization wastewater of the power plant is a chemical precipitation method, but the effect is unstable, the occupied area is large, a large amount of sludge is generated, and the sludge treatment cost is high. Therefore, it is one of the problems to be solved urgently at the present stage to provide a method capable of efficiently removing calcium ions in desulfurization wastewater, reducing dosing cost and reducing sludge generation.
Disclosure of Invention
The hard calcium in the desulfurization wastewater is mainly removed by adding sodium carbonate for softening, and the reaction formula is as follows: ca2++CO3 2-→CaCO3And ↓, according to the equation, the molar concentration of calcium ions to the molar concentration of carbonate radical is 1:1 theoretically to completely remove the calcium ions from the water. The inventor of the application finds that the adding proportion of carbonate and calcium ions in water is often more than 1 on the practical engineering project due to the mutual interference of various ions in the desulfurization wastewater, even the adding proportion reaches more than 2, and the content of the calcium ions in the desulfurization wastewater after hardness removal is still higher. Therefore, in actual engineering, the problem of overlarge sodium carbonate dosing amount often exists, and the sodium carbonate is expensive in cost, and the pH value needs to be adjusted back in subsequent advanced treatment, so that the acid addition amount is increased, and the dosing cost in the desulfurization wastewater softening pretreatment process is high. Therefore, the inventor of the application provides a method and a device for softening and removing calcium from desulfurization wastewater, which can effectively reduce calcium ions in the desulfurization wastewater and reduce the dosage of chemical agents and the generation amount of sludge.
According to a first aspect of the present invention, embodiments of the present application provide a method for softening and decalcifying desulfurized wastewater, comprising the following steps:
S1: adding a calcium removal promoter into the desulfurization wastewater treated by the triple box to obtain first produced water, wherein the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15; and S2: and (4) adding sodium carbonate into the first produced water obtained by the treatment in the step (S1) for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2.
The calcium removal promoter can effectively promote the hardness removal efficiency of sodium carbonate and improve the removal rate of calcium ions.
In some embodiments, the calcium removal promoter is calcium carbonate precipitation nuclei. The proper amount of calcium carbonate precipitation nuclei is advantageous in accelerating the formation of the precipitate in step S2.
In some embodiments, the precipitate generated in step S2 is refluxed to step S1 for dosing as a calcium removal promoter. The precipitate generated in step S2 is a calcium carbonate precipitation nucleus, and thus may be quantitatively added by refluxing the precipitate to step S1.
In some embodiments, the volume ratio of the desulfurization wastewater treated by the triple box to the calcium removal promoter is controlled to be 3-7.5 in step S1. The addition amount of the calcium removal promoter is related to the volume of the desulfurization wastewater.
In some embodiments, the molar ratio of the sodium carbonate to the calcium ions in the desulfurization wastewater after triple-box treatment in step S2 is controlled to be 1.0-1.2. Due to the addition of the calcium removal accelerant, the addition amount of sodium carbonate is greatly reduced, and the dosing cost is reduced.
In some embodiments, the second produced water is subjected to an advanced treatment. The second product water is only removed of calcium ions and needs further advanced treatment.
According to a second aspect of the present invention, an embodiment of the present application provides a desulfurization wastewater softening and calcium removing device, including a first reactor and a second reactor, the desulfurization wastewater treated by a triple box is sent into the first reactor, the first reactor is provided with a calcium removal promoter feeding device for controlling a volume ratio of the desulfurization wastewater to the calcium removal promoter to be 3-15, a water outlet end of first product water generated by the first reactor is connected with the second reactor, and the second reactor is provided with a sodium carbonate feeding device for controlling a molar ratio of sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box to be 0.8-1.2.
In some embodiments, the calcium removal promoter is calcium carbonate precipitation nuclei. The calcium removal promoter can be additionally selected from calcium carbonate precipitation crystal nuclei and can also be taken from the second reactor.
In some embodiments, the precipitate outlet end of the second reactor is connected to a calcium removal promoter dosing device. The precipitate from the second reactor may be added as calcium eliminating promoter.
In some embodiments, the calcium removal accelerant feeding device controls the volume ratio of the desulfurization wastewater treated by the triple box to the calcium removal accelerant to be 3-7.5.
in some embodiments, the sodium carbonate feeding device controls the molar ratio of sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box to be 1.0-1.2.
In some embodiments, the second product water produced by the second reactor is sent to an advanced treatment system.
The embodiment of the application provides a method and a device for softening and removing calcium from desulfurization wastewater, wherein a calcium removal promoter is added into the desulfurization wastewater treated by a triple box to obtain first produced water, and the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15; and adding sodium carbonate into the first produced water for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2. Therefore, only calcium hardness and not magnesium hardness can be removed in the process of softening and hardness removal of the desulfurization wastewater, namely half softening can be realized, so that the adding cost of chemical agents is reduced, the use cost of the chemical agents in the desulfurization wastewater can be reduced to 70-80 yuan/ton and reduced to 30-40 yuan/ton, and the removal efficiency of the calcium hardness under the condition of various ion interferences in the desulfurization wastewater is improved.
drawings
the accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the invention. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.
FIG. 1 is a flow chart of a method for softening and decalcifying desulfurization waste water according to an embodiment of the present invention;
FIG. 2 is a schematic view of a desulfurization waste water softening and decalcifying apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be described in detail with reference to fig. 1, and the inventors of the present application found through field experiments that, as shown in table 1, it is difficult to reduce calcium ions in the desulfurization wastewater to below 100mg/L by adding sodium carbonate alone without adding a calcium removal promoter, and even if the molar concentration ratio of sodium carbonate to calcium ions reaches 1.8, the concentration of calcium ions in the supernatant is still above 550mg/L, so that it is necessary to find a simpler, more convenient and more efficient way to remove calcium hardness.
TABLE 1 Effect of different dosage of chemical on removal of calcium ions from desulfurized wastewater
One embodiment of the invention provides a method for softening and removing calcium from desulfurization wastewater, which comprises the following steps:
S1: adding a calcium removal promoter into the desulfurization wastewater treated by the triple box to obtain first produced water, wherein the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15; and S2: and (4) adding sodium carbonate into the first produced water obtained by the treatment in the step (S1) for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2.
in a specific embodiment, under the condition that the chemical hardness removal agent is added in a certain amount, the calcium removal promoter can promote the calcium hardness removal efficiency to be improved. In a further embodiment, the volume ratio of the desulfurization wastewater treated by the triple box to the calcium removal promoter in step S1 may be controlled to be 3-7.5.
In a specific example, the precipitate generated in step S2 is refluxed to step S1 and added as a calcium removal promoter. The precipitate generated in step S2 is calcium carbonate precipitation nuclei, so in a preferred embodiment, the precipitate generated in step S2 can be returned to step S1 as a calcium removal promoter, which can reduce the addition amount and the dosing cost of chemicals, and can reduce the use cost of chemicals in the desulfurization wastewater to 70-80 yuan/ton and 30-40 yuan/ton.
In a further embodiment, in the step S2, the molar ratio of the sodium carbonate to the calcium ions in the desulfurization wastewater after the triple-box treatment may be controlled to be 1.0 to 1.2. Due to the addition of the calcium removal accelerant, the reaction of sodium carbonate and calcium ions is promoted, the softening and calcium removal efficiency is improved, the addition amount of sodium carbonate is greatly reduced, and the dosing cost is reduced.
In a specific embodiment, the second produced water is subjected to an advanced treatment. The second produced water produced in step S2 has only calcium ions removed and needs further advanced treatment such as membrane process treatment or the like.
The method and the device can realize semi-softening of the desulfurization wastewater, and the semi-softening of the desulfurization wastewater is mainly still hard to remove calcium, because the hard magnesium has little pollution to the membrane, if hard magnesium is to be removed, the dosing cost is very high again, so that hard magnesium does not need to be removed, the hard calcium is removed through the semi-softening of the desulfurization wastewater, the desulfurization wastewater can meet the requirement of subsequent treatment, and the cost can be reduced.
Example one
The inventors of the present application found in experiments that: under the condition of adding the same amount of sodium carbonate, compared with the condition that no calcium removal promoter is added before adding the sodium carbonate, the calcium ion concentration in the desulfurization wastewater is obviously reduced after adding the same amount of sodium carbonate after adding the calcium removal promoter before adding the sodium carbonate and reacting, as shown in table 2.
TABLE 2 influence of calcium removal by addition of calcium removal hardening accelerator
Example two
On the basis of the above steps S1 and S2, the following test S1 is performed: adding a calcium removal promoter into the desulfurization wastewater treated by the triple box to obtain first produced water, wherein the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15. S2: adding sodium carbonate into the first produced water obtained by the treatment of the step S1 to perform softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 1.1, and the results shown in Table 3 are obtained:
TABLE 3 influence of the proportion of calcium-removing promoter added on the calcium removal of wastewater
As can be seen from table 3, the addition of an appropriate amount of the calcium removal promoter significantly reduces calcium ions in the desulfurization wastewater after the reaction in step S2, the volume ratio of the desulfurization wastewater to the calcium removal promoter is 15, the calcium ions can be reduced to below 500mg/L, the removal rate of the calcium ions is higher than that when the calcium removal promoter is not added and the dosage ratio of sodium carbonate is 1.8, after the volume ratio of the desulfurization wastewater to the calcium removal promoter is further reduced, the calcium ions can be further removed to below 100mg/L, the removal rate of the calcium ions reaches above 90%, and the dosage ratio of sodium carbonate is only 1.1 at this time. The magnesium ion is not reduced much after the calcium removing promoter is added. The inventor of the application innovatively finds that the addition of a proper amount of calcium carbonate precipitation crystal nucleus is obviously beneficial to accelerating the generation of precipitates in the subsequent reaction, and on the one hand, the proper amount of calcium carbonate precipitation crystal nucleus can accelerate the reaction rate of the subsequent reaction; on the other hand, a proper amount of calcium carbonate precipitation crystal nuclei can be used as crystal seeds to promote the nucleation growth of calcium carbonate precipitation in the subsequent reaction, so that the subsequent reaction moves towards the generation direction of the calcium carbonate precipitation, and the calcium ions in the wastewater can be effectively desulfurized. And under the conditions of existence of multiple ions and interference of other ions, the calcium removal promoter is added, so that other ions cannot be influenced, for example, magnesium ions are not greatly influenced, and the calcium hardness removal efficiency can be improved.
EXAMPLE III
On the basis of the above steps S1 and S2, the following test S1 is performed: adding a calcium removal promoter into the desulfurization wastewater treated by the triple box to obtain first produced water, wherein the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3. S2: adding sodium carbonate into the first produced water obtained by the treatment in the step S1 for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2, and the results shown in Table 4 are obtained:
TABLE 4 influence of different sodium carbonate addition on calcium removal from wastewater
As can be seen from table 4, after the calcium removal promoter is added in step S1, sodium carbonate with a different proportion to calcium ions in the desulfurization wastewater treated by the triple box is added, the dosing amount proportion of the sodium carbonate is adjusted to 0.8-1.2, and it is found that the calcium ions are reduced to below 300mg/L, and the removal rate of the calcium ions reaches above 85%. When the dosing amount ratio of sodium carbonate is 1.0-1.2, the removal rate of calcium ions can further reach more than 95%, but the content of magnesium ions is not changed too much, so that the calcium ions in the desulfurization wastewater can be effectively removed by using the desulfurization wastewater softening and calcium removing method, and the calcium removing promoter can be obtained from the precipitate generated in the step S2, so that the dosing cost can be saved.
The embodiment of the application provides a desulfurization waste water softens decalcification device, including first reactor 1 and second reactor 2, desulfurization waste water after the triplex box is handled is sent into first reactor 1, first reactor 1 is equipped with except that the calcium promoter puts in device 11 and is used for controlling desulfurization waste water and the volume ratio of calcium promoter 3 ~ 15, the play water end and the second reactor 2 of the first product water that first reactor 1 produced are connected, second reactor 2 is equipped with sodium carbonate and puts in device 21 and is used for controlling the molar ratio of sodium carbonate and the calcium ion in the desulfurization waste water after the triplex box is handled and is 0.8 ~ 1.2.
In a specific embodiment, the calcium removal promoter is calcium carbonate precipitation nuclei. The calcium removal promoter can be additionally selected from calcium carbonate precipitation crystal nuclei and can also be taken from the second reactor 2. In a preferred embodiment, the sediment outlet of the second reactor 2 is connected to a calcium removal promoter dosing device 11. Under the condition, the dosage can be reduced, the dosing cost is saved, the use cost of chemical agents in the desulfurization wastewater is reduced to 30-40 yuan/ton from 70-80 yuan/ton, and the calcium removal efficiency can be obviously improved by adding the calcium removal promoter.
In a specific embodiment, the calcium removal accelerant feeding device 11 controls the volume ratio of the desulfurization wastewater treated by the triple box to the calcium removal accelerant to be 3-7.5. The calcium removal promoter is added into the first reactor 1 through the calcium removal promoter adding device 11, so that calcium ions in the desulfurization wastewater after reaction in the second reactor 2 are obviously reduced, the volume ratio of the desulfurization wastewater to the calcium removal promoter is 15, the calcium ions can be reduced to be below 500mg/L, the removal rate of the calcium ions is higher than that when the calcium removal promoter is not added and the dosage ratio of sodium carbonate is 1.8, after the volume ratio of the desulfurization wastewater to the calcium removal promoter is further reduced to 3-7.5, the calcium ions can be further removed to be below 100mg/L, the removal rate of the calcium ions reaches over 90%, and the dosage ratio of the sodium carbonate is only 1.1. The magnesium ion is not reduced much after the calcium removing promoter is added. The inventor of the application innovatively finds that the addition of a proper amount of calcium carbonate precipitation crystal nucleus is obviously beneficial to accelerating the generation of precipitates in the subsequent reaction, and on the one hand, the proper amount of calcium carbonate precipitation crystal nucleus can accelerate the reaction rate of the subsequent reaction; on the other hand, a proper amount of calcium carbonate precipitation crystal nuclei can be used as crystal seeds to promote the nucleation growth of calcium carbonate precipitation in the subsequent reaction, so that the subsequent reaction moves towards the generation direction of the calcium carbonate precipitation, and the calcium ions in the wastewater can be effectively desulfurized.
In a specific embodiment, the sodium carbonate feeding device 21 controls the molar ratio of the sodium carbonate to the calcium ions in the desulfurization wastewater treated by the triple box to be 1.0-1.2. After the calcium removal promoter is added into the first reactor 1, the sodium carbonate adding device 21 is used for controlling the sodium carbonate adding amount proportion which is different from the calcium ion proportion in the desulfurization wastewater treated by the triple box, the sodium carbonate adding amount proportion is adjusted to be 0.8-1.2, the calcium ion is reduced to be below 300mg/L, and the calcium ion removal rate is up to more than 85%. When the dosing proportion of sodium carbonate is 1.0-1.2, the removal rate of calcium ions can further reach more than 95%, but the content of magnesium ions is not changed too much, so the calcium ions in the desulfurization wastewater can be effectively removed by using the desulfurization wastewater softening and calcium removing device, and the calcium removing promoter can be obtained from the precipitate generated in the second reactor 2, so the dosing cost can be saved.
In a particular embodiment, the second product water produced by the second reactor 2 is sent to an advanced treatment system 3.
the embodiment of the application provides a method and a device for softening and removing calcium from desulfurization wastewater, wherein a calcium removal promoter is added into the desulfurization wastewater treated by a triple box to obtain first produced water, and the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15; and adding sodium carbonate into the first produced water for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2. Therefore, only calcium hardness and not magnesium hardness can be removed in the process of softening and hardness removal of the desulfurization wastewater, namely half softening can be realized, so that the adding cost of chemical agents is reduced, the use cost of the chemical agents in the desulfurization wastewater can be reduced to 70-80 yuan/ton and reduced to 30-40 yuan/ton, and the removal efficiency of the calcium hardness under the condition of various ion interferences in the desulfurization wastewater is improved.
While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details of the embodiments are not to be interpreted as limiting the scope of the invention, and any obvious changes, such as equivalent alterations, simple substitutions and the like, based on the technical solution of the invention, can be interpreted without departing from the spirit and scope of the invention.
Claims (12)
1. A method for softening and removing calcium from desulfurization wastewater is characterized by comprising the following steps:
S1: adding a calcium removal promoter into the desulfurization wastewater treated by the triple box to obtain first produced water, wherein the volume ratio of the desulfurization wastewater to the calcium removal promoter is controlled to be 3-15; and
S2: and (3) adding sodium carbonate into the first produced water obtained by the treatment in the step (S1) for softening treatment to generate a precipitate and second produced water, wherein the molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2.
2. The method for softening and decalcifying desulfurization waste water according to claim 1, wherein the decalcifying promoter is calcium carbonate precipitation nuclei.
3. The desulfurization wastewater softening calcium-removing method as recited in claim 1, wherein the precipitate generated in the step S2 is refluxed to the step S1 to be added as the calcium-removing promoter.
4. the desulfurization wastewater softening and calcium removing method according to claim 1, wherein the volume ratio of the desulfurization wastewater subjected to triple box treatment to the calcium removal promoter in step S1 is controlled to be 3-7.5.
5. The method for softening and removing calcium from desulfurization wastewater according to claim 1, wherein the molar ratio of the sodium carbonate to the calcium ions in the desulfurization wastewater after the triple-box treatment is controlled to be 1.0-1.2 in step S2.
6. The desulfurization waste water softening and calcium-removing method according to claim 1, characterized in that the second produced water is subjected to advanced treatment.
7. The utility model provides a desulfurization waste water softens decalcification device, its characterized in that includes first reactor and second reactor, desulfurization waste water after the triplex box is handled is sent into first reactor, first reactor is equipped with except that calcium promoter input device is used for control desulfurization waste water with the volume ratio of decalcification promoter is 3 ~ 15, the play water end of the first product water that first reactor produced with the second reactor is connected, the second reactor is equipped with sodium carbonate input device and is used for control sodium carbonate with the mole ratio of calcium ion is 0.8 ~ 1.2 in the desulfurization waste water after the triplex box is handled.
8. The desulfurization wastewater softening calcium-removing device as recited in claim 7, wherein the calcium-removing promoter is calcium carbonate precipitation nuclei.
9. The desulfurization wastewater softening calcium-removing device of claim 7, wherein the precipitate outlet end of the second reactor is connected with the calcium-removing promoter feeding device.
10. The desulfurization wastewater softening and calcium removing device according to claim 7, wherein the calcium removal promoter feeding device controls the volume ratio of the desulfurization wastewater subjected to triple box treatment to the calcium removal promoter to be 3-7.5.
11. The desulfurization wastewater softening and calcium-removing device according to claim 7, wherein the sodium carbonate feeding device controls the molar ratio of the sodium carbonate to the calcium ions in the desulfurization wastewater treated by the triple box to be 1.0-1.2.
12. The desulfurization waste water softening and calcium-removing device of claim 7, wherein the second produced water produced by the second reactor is sent to an advanced treatment system.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461130A (en) * | 2021-07-14 | 2021-10-01 | 浙江大学 | Papermaking wastewater treatment method utilizing seed crystal mediated enhanced calcium precipitation |
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| KR20000038542A (en) * | 1998-12-08 | 2000-07-05 | 김충섭 | Method for controlling calcium hardness |
| CN1778718A (en) * | 2005-01-06 | 2006-05-31 | 蔡梅初 | Treatment for softening seawater by single-decalcification |
| CN102936067A (en) * | 2012-11-23 | 2013-02-20 | 天津凯铂能膜工程技术有限公司 | Method for selectively removing calcium ions from concentrated water byproduct of sea water desalination process and other high-calcium-magnesium-content concentrated brines |
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Application publication date: 20191213 |
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